JPS6027593Y2 - Sludge dewatering equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sludge dewatering device that sends sludge from a gravity dewatering section to a compression dewatering section to remove moisture from the sludge.

In general, in a sludge dewatering device that has a gravity dewatering section and a compression dewatering section, sludge is dropped onto an endless filter cloth wrapped around a roller, and gravity dewatering is performed together with the endless filter cloth before reaching the roller folding section. When the endless filter cloth is folded back, it is turned over and reaches the compression dewatering section.

However, in this sludge dewatering device, as gravity dewatering progresses, solids with large particles gradually accumulate on the surface of the filter cloth, followed by small solids, and compaction progresses.

For this reason, the filtration performance of the filter cloth deteriorates, and the separated water generated above the sludge that has fallen into the gravity section cannot pass through the filter cloth.

As a result, the amount of water removed in the gravity dewatering section is limited.
Since the moisture content of the sludge sent to the press dewatering section is high, if a large amount of sludge is sent to the press dewatering section, a side leak occurs where sludge falls off from the width direction of the filter cloth, which limits the amount of sludge supplied to the press dewatering section. I needed to.

The present invention takes the above facts into consideration and aims to provide a sludge dewatering device that can effectively discharge separated water in the gravity dewatering section and supply a large amount of sludge to the press dewatering section.

The sludge dewatering device according to the present invention is provided with a folding chute corresponding to the folded part of the filter cloth in the roller section, and this folding chute is equipped with a porous screen compatible with the endless filter cloth, so that the sludge after being turned is transferred onto this screen. The separated water is effectively discharged through a porous screen to lower the water content of sludge.

Embodiments of the present invention will be described below with reference to the drawings.

The sludge dewatering apparatus 10 of this embodiment shown in FIG. 1 has an upper endless filter cloth 12 and a lower endless filter cloth 14.

The upper endless filter cloth 12 is wound around a pair of rollers 16, 1B and folded back, and is driven in the direction of arrow A in FIG. 1 by rotating the rollers 16 by a drive device (not shown).

Similarly to the upper endless filter cloth 12, the lower endless filter cloth 14 is also wound around a pair of rollers 2G and 22 and folded back, and is moved in the direction of arrow B by rotating the roller 20 by a drive device (not shown). It looks like this.

The roller 16 around which these endless filter cloths 12 and 14 are wrapped
, 18, 20, and 22 have their axes parallel to each other, and the lower half of the upper endless filter cloth 12 and the upper half of the lower endless filter cloth 14 are both held by a pressure roller group 24 and are in close contact with each other. A compressing and dewatering section that moves in the direction of the rollers 16 and 20 is constituted.

On the other hand, the upper endless filter cloth 12 has a gravity dewatering section between the horizontal part of the upper half and the pressure roller group 24, and the sludge 28 from the sludge supply device 26 provided approximately in the middle of the horizontal part of the upper half. is dropped onto the endless filter cloth 12, and the endless filter cloth 12
While moving in the direction of arrow A, water permeates through the endless filter cloth 12 and is dehydrated, before reaching the compression dewatering section.

As shown in FIG. 2, in this embodiment, a folding chute 30 is provided corresponding to the endless filter cloth 12 that is wound around the roller 18 and folded back.

This turning chute 30 has a screen 32 and a chute cover 34.

The screen 32 is a net-like body, and spans the folding front and rear of the upper endless filter cloth 12 folded back by the roller 18, that is, the upper end is at the folding midpoint 12A of the upper endless filter cloth 12.
The lower part thereof is inclined to a position approaching the lower endless filter cloth 14, and is arranged parallel to the upper endless filter cloth 12 at a predetermined interval.

Therefore, the sludge 28 is loaded onto the screen 32, which is turned over as the endless filter cloth 12, which is folded back by the rollers 18, advances.

The chute cover 34 is arranged parallel to the screen 32 and on the outside of the screen 32, that is, on the opposite side from the roller 18, with a predetermined distance therebetween, so as to receive the water removed from the screen 32.

To explain the operation of this embodiment configured in this way, the sludge 28 dropped from the sludge supply device 26 onto the horizontal portion of the upper endless filter cloth 12 reaches the roller folding portion as the upper endless filter cloth 12 advances.

A considerable amount of water in the sludge 28 passes through the upper endless filter cloth 12 and is discharged from the sludge supply device 26 to the roller folding section.

However, as the dewatering operation progresses, solid matter blocks the permeation holes in the upper endless filter cloth 12, making it impossible to sufficiently drain the separated water present near the top of the sludge 28.

The sludge 28 that has reached the folded part of the roller 18 is turned over together with the upper endless filter cloth 12 at the folded part and falls onto the screen 32.

As a result of the sludge being reversed and loaded onto the screen 32 in this way, the separated water present in the upper part of the sludge 28 is loaded onto the screen 32 side, effectively blocking the screen 32.
2 and falls onto the chute cover 34.

This drainage water is discharged from the chute cover 34 by a drainage device (not shown) or by passing through the lower endless filter cloth 14.

The sludge 28 between the folding chute 30 and the upper endless filter cloth 12 is transferred to the lower endless filter cloth 1 by the movement of the upper endless filter cloth 12.
4, and is further held between a pressing roller group 24 which is a pressing and dewatering section.

After being pressurized and dehydrated in this pressing and dehydrating section, it is discharged.

In this way, the upper separated water is effectively drained in the folding chute 30 section, so even if a large amount of sludge is supplied to the pressure roller group 24, which is the compression dewatering section, side leaks do not occur and efficiency is high. Able to carry out dehydration work.

Note that the screen 32 in the above embodiments can be made of any porous material.

As explained above, the sludge dewatering device according to the present invention is equipped with a folding chute with a porous screen corresponding to the folded endless filter cloth, so that the separated water in the gravity dewatering section can be effectively drained and transferred to the press dewatering section. It has an excellent effect of increasing the amount of sludge supplied.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the sludge dewatering apparatus according to the present invention, and FIG. 2 is a sectional view showing a folded chute portion. 10... Sludge dewatering device, 12... Upper endless filter cloth, 14... Lower endless filter cloth, 16, 18
, 20° 22...Tara, 24...Pressure roller group, 26...Sludge supply device, 28...
...Sludge, 30...Turn back chute, 32
...Screen, 34...Shoot cover.

Claims (3)

[Scope of utility model registration request] (1) In a sludge dewatering device where the endless filter cloth is wound around a roller and folded back so that the sludge on the endless filter cloth is transferred from the gravity dewatering section to the compression dewatering section, a porous screen corresponding to the folded endless filter cloth is installed. 1. A sludge dewatering device characterized by being provided with a turn-back chute for loading sludge after being turned over. (2) The sludge dewatering device according to claim 1, wherein the screen is provided over the folded front and rear portions of the endless filter cloth. (3) The sludge dewatering apparatus according to claim 1 or 2, wherein the folding chute is provided with a chute cover on the outside to receive the sludge separated water from the screen.